关于一个WEB项目中的异常处理问题。。。。。。。。。。

想问一下，在一个项目中大家都是如何处理异常的。是开发者自己去捕获抛出异常，还是把异常给一个统一的类去处理。在SSH框架中异常是怎么处理的，是在事务层处理？最好说的详细一些。谢谢了

解决方案 »

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那现在异常都不用统一类来处理吗，就自己在程序中try catch吗
struts有异常处理模型，只是一般书上都不说而已
实际上struts的异常处理个人认识还是非常优雅的，在XML里可以指定不同的异常给不同的处理页面
详细用法GOOGLE一下吧
做了个简单的示例
struts.xml<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
 "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
 "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.objectFactory" value="spring" />
<constant name="struts.i18n.encoding" value="utf-8" />
<constant name="struts.custom.i18n.resources" value="global,struts" />
<constant name="struts.action.extension" value=",do,action" ></constant>

<package name="myPkg" extends="struts-default">

<global-results>
<result name="ex1">/ex1.jsp</result>
<result name="ex2">/ex2.jsp</result>
</global-results>

<global-exception-mappings>
<exception-mapping result="ex1" exception="java.lang.ClassNotFoundException"></exception-mapping>
<exception-mapping result="ex2" exception="java.lang.ClassCastException"></exception-mapping>
</global-exception-mappings>
</package>

<package name="my" extends="myPkg" namespace="/">
<global-results>
<result name="success">/ok.jsp</result>
</global-results>

<action name="myDoing_1" class="testAction" method="myDoing_1"/>
<action name="myDoing_2" class="testAction" method="myDoing_2"/>

<action name="myDoing_3" class="testAction" method="myDoing_3"/>
</package>
</struts>
TestAction:import com.opensymphony.xwork2.ActionSupport;public class TestAction extends ActionSupport {
public String myDoing_1() throws ClassNotFoundException {
if(true)
throw new java.lang.ClassNotFoundException();

return SUCCESS;
}

public String myDoing_2() throws ClassCastException {
if(true)
throw new java.lang.ClassCastException();

return SUCCESS;
}

public String myDoing_3() {
return SUCCESS;
}
}spring配置<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean id="testAction" class="com.mo2.web.rsms.action.TestAction" />

</beans>
测试的页面
test.html<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>test.html</title>
<meta http-equiv="keywords" content="enter,your,keywords,here" />
<meta http-equiv="description" content="A short description of this page." />
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />


</head>
<body>

第一个测试,返回ClassNotFoundException异常 
<a href="myDoing_1.action">第一个测试</a>


第二个测试,返回ClassCastException异常 
<a href="myDoing_2.action">第二个测试</a>


第三个测试,返回正常 
<a href="myDoing_3.action">第三个测试</a>

</body>
</html>ex1.jsp<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>

 <title>My JSP 'ex1.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
 </head>

 <body>
 异常的返回页面 1
 </body>
</html>ex2.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>

 <title>My JSP 'ex1.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
 </head>

 <body>
 异常的返回页面2
 </body>
</html>
OK.jsp是一个空白的页面，用来表示正常操作
spring的AOP配置

<aop:config>

<aop:aspect ref="log">

<aop:pointcut id="mycut" expression="execution(* com.xx.oa.service.*.*.*.*(..))"/>
 
 <aop:after-returning pointcut-ref="mycut" method="afterReturn" returning="obj"/>
 
 <aop:after-throwing pointcut-ref="mycut" method="doThrowing" throwing="ex"/>
</aop:aspect>
</aop:config>
<bean id="log" class="com.boxun.crm.log.LogAop"></bean>